Here is the Wiltons butter cream icing and simple instructions on filling the icing bag (sometimes it's harder than it looks!)
1/2 cup Butter
1/2 cup Crisco
1 teaspoon vanilla
4 cups of powder sugar
2 TABLEspoons milk
Cream butter and crisco together, add 1 cup powder sugar at a time. By the second cup of powder sugar add the Vanilla and milk.
Make sure you keep track of how many cups you put in! If you don't add enough it will not be stiff enough to decorate with. It will look kinda runny.
It should look like this:
After you chose the colors of icing you want (using the GEL from Wiltons, not the liquid stuff you get at the grocery store- it will thin it out). Snip the tip of your icing bags (available at Wal*Mart) and place in the small piece of ___________ fold the top of bag over and place your hands under it (this will make sure your bag doesn't get too dirty along with your hands). Scoop the icing in and try to get it as close tot he bottom as you can.